package com.meilai.project.util;

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;


/**
 * 旋转图片工具类
 *
 * @author 大脑补丁
 */
public class RotateImageUtil {

    /**
     * 图像旋转
     *
     * @param src
     * @param angel
     * @return
     */
    public static BufferedImage Rotate(Image src, double angel) {
        int src_width = src.getWidth(null);
        int src_height = src.getHeight(null);
        // calculate the new image size
        Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(
                src_width, src_height)), angel);

        BufferedImage res = null;
        res = new BufferedImage(rect_des.width, rect_des.height,
                BufferedImage.TYPE_3BYTE_BGR);
        Graphics2D g2 = res.createGraphics();
        // transform
        g2.translate((rect_des.width - src_width) / 2,
                (rect_des.height - src_height) / 2);
        g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);

        g2.drawImage(src, null, null);
        return res;
    }

    public static Rectangle CalcRotatedSize(Rectangle src, double angel) {
        // if angel is greater than 90 degree, we need to do some conversion
        if (angel >= 90) {
            if (angel / 90 % 2 == 1) {
                int temp = src.height;
                src.height = src.width;
                src.width = temp;
            }
            angel = angel % 90;
        }

        double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
        double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
        double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
        double angel_dalta_width = Math.atan((double) src.height / src.width);
        double angel_dalta_height = Math.atan((double) src.width / src.height);

        int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
                - angel_dalta_width));
        len_dalta_width = len_dalta_width > 0 ? len_dalta_width : -len_dalta_width;

        int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
                - angel_dalta_height));
        len_dalta_height = len_dalta_height > 0 ? len_dalta_height : -len_dalta_height;

        int des_width = src.width + len_dalta_width * 2;
        int des_height = src.height + len_dalta_height * 2;
        des_width = des_width > 0 ? des_width : -des_width;
        des_height = des_height > 0 ? des_height : -des_height;
        return new Rectangle(new Dimension(des_width, des_height));
    }

//    /**
//     * 获取网络图片流（附加）
//     *
//     * @param url
//     * @return
//     */
//    public static InputStream getImageStream(String url) {
//        try {
//            HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
//            connection.setReadTimeout(5000);
//            connection.setConnectTimeout(5000);
//            connection.setRequestMethod("GET");
//            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
//                InputStream inputStream = connection.getInputStream();
//                return inputStream;
//            }
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
//        return null;
//    }

    public static URLConnection getURLConnection(String url) {
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
            connection.setReadTimeout(10000);
            connection.setConnectTimeout(10000);
            connection.setRequestMethod("GET");
            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                return connection;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}


